71 lines
2.7 KiB
Java
71 lines
2.7 KiB
Java
/*******************************************************************************
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* Copyright (c) 2008 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.analysis.reflection;
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import com.ibm.wala.analysis.typeInference.PointType;
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import com.ibm.wala.classLoader.CallSiteReference;
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import com.ibm.wala.classLoader.IClass;
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import com.ibm.wala.classLoader.IMethod;
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import com.ibm.wala.ipa.callgraph.CGNode;
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import com.ibm.wala.ipa.callgraph.Context;
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import com.ibm.wala.ipa.callgraph.ContextSelector;
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import com.ibm.wala.ipa.callgraph.propagation.ConstantKey;
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import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
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import com.ibm.wala.util.intset.EmptyIntSet;
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import com.ibm.wala.util.intset.IntSet;
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import com.ibm.wala.util.intset.IntSetUtil;
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/**
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* A {@link ContextSelector} to intercept calls to Class.newInstance()
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*/
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class ClassNewInstanceContextSelector implements ContextSelector {
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public ClassNewInstanceContextSelector() {
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}
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/**
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* If receiver is a {@link ConstantKey} whose value is an {@link IClass}, return a {@link JavaTypeContext}
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* representing the type of the IClass. (This corresponds to the case where we know the exact type that will be
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* allocated by the <code>Class.newInstance()</code> call.) Otherwise, return <code>null</code>.
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*/
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@Override
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public Context getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] receiver) {
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if (callee.getReference().equals(ClassNewInstanceContextInterpreter.CLASS_NEW_INSTANCE_REF) && isTypeConstant(receiver[0])) {
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IClass c = (IClass) ((ConstantKey) receiver[0]).getValue();
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if (!c.isAbstract() && !c.isInterface()) {
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return new JavaTypeContext(new PointType(c));
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}
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}
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return null;
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}
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private static boolean isTypeConstant(InstanceKey instance) {
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if (instance instanceof ConstantKey) {
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ConstantKey c = (ConstantKey) instance;
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if (c.getValue() instanceof IClass) {
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return true;
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}
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}
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return false;
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}
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private static final IntSet thisParameter = IntSetUtil.make(new int[]{0});
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@Override
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public IntSet getRelevantParameters(CGNode caller, CallSiteReference site) {
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if (ClassNewInstanceContextInterpreter.CLASS_NEW_INSTANCE_REF.equals(site.getDeclaredTarget())) {
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return thisParameter;
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} else {
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return EmptyIntSet.instance;
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}
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}
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}
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